These ties would be weakened or severed if border controls were reintroduced.
As part of the declaration, Ethiopia and Eritrea agreed to restore the diplomatic, trade and transportation links that were severed during the border war they fought between 1998 and 2000.
Diplomatic relations between Pakistan and Afghanistan were severed (1961 63) after some border clashes and continued Afghan agitation, supported by the USSR, for an independent Pushtunistan.
Oxfam said fighting at the border has severed trade, cutting off the vital flow of people, fuel and goods, and affecting the ability of people to earn a living.
The crisis began early this month, when South Korea accused the North of planting three land mines that exploded along the two countries' border, severing the legs of two South Korean soldiers.
The Canadian decision had no immediate effect across the border because the severed rail line meant Maine shippers had to reroute traffic.
Seoul says North Korea also appears to have carried out a threat made last week to sever a cross-border hotline.
Several neighbourly spats: putting one over on Colombia, with whom Ecuador briefly severed diplomatic relations in 2008 over a border incursion by their bigger northern neighbours, would be sweet – a meeting of the teams is known as El Clásico Tricolor.
His counterpart, President Salva Kiir of South Sudan, says his government has severed ties with the rebels over the border.
Scrambling to meet the judge's reunification deadline, government chaperons transported children from shelters scattered across the country to immigration jails near the border where they had been severed from their parents weeks or months before.
Cross-border transport links were largely severed; 10 main railway lines, 24 secondary lines, 23 autobahns or national roads, 140 regional roads and thousands of smaller roads, paths and waterways were blocked or otherwise interrupted.
